#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
//int main()
//{
//	char acX[] = "abcdefg";
//	char acY[] = { 'a','b','c','d','e','f','g' };
//	printf("%d\n", sizeof(acX));
//	printf("%d\n", sizeof(acY));
//	return 0;
//}

//int main()
//{
//	int arr[] = { 1,2,(3,4),5 };
//	printf("%d\n", sizeof(arr));
//	return 0;
//}

int main()
{
	int a = 0;
	int b = 0;
	int c = 0;
	while (scanf("%d %d %d", &a, &b, &c) != EOF)
	{
		if (a + b > c && a + c > b && b + c > a)
		{
			if (a == b && b == c)
				printf("Equilateral triangle!\n");
			else if (a == b && a != c || a == c && a != b || b == c && c != a)
				printf("Isosceles triangle!\n");
			else
				printf("Ordinary triangle!\n");
		}
		else
			printf("Not a triangle!\n");
	}
	return 0;
}